Car-wheel.



710.856,677. PATENTED JUNBu, 1907. T. s. BLAIR, JB. GAR WHEEL.

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k1 N g PATENT OFFIUE,

THOMAS S. BLAIR, JR., OF ELMHURST, ILLINOIS.

CAR-WHEEL.

Specication of Letters Patent.

Patented June 11, 1907.

Application filed March 14,1907. Serial N0. 362,375.

To all wir/m, llt rit/.ty cm1/cern.'

Be it known that I, THOMAS S. BLAIR, Jr., a citizen of the United States, residing at Elmhurst, in the county of Dupage and State of Illinois, have invented a new and useful Improvement in Car-Vheels, of which the following is a specification.

My invention relates to an improvement in the specific construction of car-wheel shown and described in my application for Letters Patent of the United States Serial. No. 285,109, filed October 30, 1905; my obf ject being to provide a practically more desirable union between the rim of the softer'- metal center and the tire of harder metal, than that afforded by the ring between them of angle-iron shape in cross-section.

In the practical manufacture of the carwheel of the construction exemplified in said application I found that the points of contact of the inner edges of the V-shaped insert with the sand were so delicate that the metal tended to cut through the joint, and that this shape was difficult and expensive to produce in ring-form. These objections are entirely overcome by my present improvement, which consists of a U-shape in cross-section of the insert, since it affords adequate contact surface between the insert and the sand for producing a tight joint, and is readily reducible to annular form.

In the accompanying drawing, Figure 1 is a view in cross-section of a mold suitable for the manufacture of my improved car-wheel, the view being in the nature of a diagram illustrating f the procedure involved in the manufacture thereof; and Fig. 2 is a view of the wheel in broken sectional elevation.

The flask shown at 3 consists of the circular drag 4, an annular chill 5 surrounding the drao and a circular cope 6 surmounting the chil these parts being separably fastened together by pins 7 passing through coincident holes in ears 8 and 9, respectively projecting from the drag and cope, and ears 10, 11 projecting from the chill. I/Vhen the mold has been formed in the usual way within the flask, with a pattern, in sand 13, prior to adjusting the parts of the flask together, a metal key 12, substantially of U-shape in cross-section, and preferably in the form of a continuous or complete annulus, made of sheet-metal and of the diameter intended for the wheel-center', is laid with its re-entrant side inward in proper position in the mold concentrically with the core 14, in which a pouring duct 15 is provided. Molten soft steel is poured through this duct into the mold to form the center 16 of the wheel 17, shown to be ribbed for its reinforcement, about its hub-portion 1S. The metal thus poured extends into the ring 12. After so forming the wheel-center of tough, soft steel, molten steel that has been treated with chromium, manganese, or other hardening medium,is poured into the mold about the ring 12 through a duct 19 in the mold leading from an opening 2() in the cope surmounted by a funnel 21, like the funnel 22 surmounting the duct 15, and fills the space 23 in the mold about the key 12 to form the hardemetal tirerim 24. 'lhe key thus joins the center and tire of the wheel, rendering them inseparable, with the advantage afforded by the particular shape of the ring shown and described, of overlapping the sides of the wheel-center 16 about its edge-portion and thereby presenting a comparatively large extent of surface for combining the ring and center together by a welded union. If the metal of the key be very thin, say one-sixteenth of an inch in thickness, it may be wholly melted by the heat of the two metals between which it is confined and thus combine with them, though even then the junction will be discernible. If the metal of the key be too thick to be entirely melted, it will nevertheless serve to securely join the tire to the center though there is liable always to be partial melting of the metal of the key sufficient to combine its surface with the metals between which it is confined.

I/Vhat I claim as new and desire to secure by Letters Patent is* 1. A cast-metal car-wheel consisting of a relatively-soft metal center having its rim of substantially U-shape in cross-section and a relatively-hard metal tire having an inner circumferential groove of said shape in crosssection with an interposed metal key of said shape in crosssection enveloping the rimportion of said center and entering into said groove in the tire for the purpose set forth.

2. A cast-metal car-wheel consisting of a relatively-soft metal center having its rim of substantially U-shape in cross-section and a lOO relatively-hard metal tire having an inner union With the center and tire for the purpose circumferential groove of said shape in erossset forth.

sleton With an interposed metal ring o f said THOMAS s BLAIR JR. s ape 1n eross-seetlon enveloplng Wlth lts 1n- 5 ner surface the rim-portion of said center and In presence of- 'enveloped about its outer surface by the R. A. SCHAEFER,

groove in said tire, the ring having Welde-Ldmim K. M. CORNWALL. 

